英文關鍵字
arrest
authority
blue
boss
business
busy
car
ceo
cfo
cop
crime
danger
discussing
emergency
employment
enforcement
equipment
explaining
force
idea
information
job
law
meeting
officer
patrol
people
police
protect
protection
reflected
reflection
road
safety
security
service
siren
speed
strategies
strategy
street
surveillance
tactic
tactics
team
teamwork
touchscreen
traffic
transportation
urban
vehicle
warning